SAT (Stage-2) Mock Test - 3

Blue-green algae, nitrogen fixing bacteria and archaebacteria are placed in kingdom Monera.

'Jointed legs' is a characteristic feature of Arthropods. The Arthropod body plan consists of segments, each with a pair of appendages. The rigid cuticle inhibits growth, so Arthropods replace it periodically by moulting.

Independent assortment of genes and their corresponding traits was first observed by Gregor Mendel in 1865 during his studies of genetics in pea plants. He was performing dihybrid crosses, which are crosses between organisms that differ with regard to two traits. He discovered that the combinations of traits in the offspring of his crosses did not always match the combinations of traits in the parental organisms. Thus, Law of Independent Assortment is formulated.

Aabb x Aabb gives 3 : 1 phenotypic ratio as Aa and bb will be the gametes and offspring will have genetic constitution of AAaa, Aabb, Aabb and bbbb.

Pangenesis was Charles Darwin's hypothetical mechanism for heredity. According to it, hereditary particles are present in every organ of the body.

Glomerular filtrate contains less glucose in comparison to plasma.

The capsule enclosing testes of mammals is called tunica albuginea. The tunica albuginea helps to trap the blood in the corpora cavernosa, thereby sustaining erection of the penis.

This is the correct option as this is not an intrinsic or internal factor which affects human health. Environmental pollution is an extrinsic factor.

The period from sexual maturity till the end of egg laying is called laying period and the chickens are known as layers.

World Environment Day is celebrated on June 5.

Since the sum is equal to 6 (an even number), if one integer is even, the other must be even.

For equal roots, D = b² - 4ac = 0
Thus, k² - 4k = 0
Thus, we get k = 0 or k = 4

Let the number of Re. 1 coins be x and that of Rs. 2 coins be y.
Then, x + 2y = 75 and x + y = 50
Solving the two equations, we get x = 25 and y = 25